Airsporter repair

[mel h]

Hi all, I've just been asked for some help in fixing a Mk II Airsporter. It has a problem that that I've not seen before but assume that it's not a unique one and would be interested in hearing of other peoples solutions or ideas.
The problem is with a stripped thread in the underside of the air chamber, at the front near the loading tap. It's for the short stud (1/4 inch dia.) threaded at each end, that holds the cocking mechanism in place.
It's a blind hole, the obvious route is to drill and tap it to a larger size, then turn a stud with suitable thread at one end to fit the larger hole.
Anone here done it before?
Mel.

[T 20]

Hi all, I've just been asked for some help in fixing a Mk II Airsporter. It has a problem that that I've not seen before but assume that it's not a unique one and would be interested in hearing of other peoples solutions or ideas.
The problem is with a stripped thread in the underside of the air chamber, at the front near the loading tap. It's for the short stud (1/4 inch dia.) threaded at each end, that holds the cocking mechanism in place.
It's a blind hole, the obvious route is to drill and tap it to a larger size, then turn a stud with suitable thread at one end to fit the larger hole.
Anone here done it before?
Mel.

Not exactly the same, Mel.

But I recently fitted a MK6 trigger block and cocking linkage to a MK2 which involved making a stud of 1/4" BSF at the cylinder end dropping down to 5mm through the linkage.

As you say drilling and tapping at 9/32" or 5/16" would seem the logical way to go as brazing a stud in would cause no end of problems in that area.

Good luck with it.




All the best Mick

[mel h]

Thanks Mick, I've started digging in the old toolboxes, I'm certain that I have an assortment 5/16 BSF taps and dies in there somewhere. I'd rather not get involved with any sort of heat if I don't have to.
Mel.

[deejayuu]

If there's enough space I would drill/tap large enough to take a sleeve back to standard. Loctite sleeve then drill/tap to original.

[tankrocker]

Why not use a helicoil thread repair , then loctite stud in for extra security.
!/4 bsf on the bay.

[mel h]

Thanks all, good food for thought, I'll talk to the owner before proceeding.
Mel.

[johnbaz]

Thanks all, good food for thought, I'll talk to the owner before proceeding.
Mel.

I have a Helicoil set somewhere Mel, I'll see if I can find it out

I'll get back to you shortly..



John